Hi guys
New owner of a Mk5 Golf GT Sport 1.4 TSI here... looking to fit an aftermarket radio soon, just gathering information before I take the plunge.

I have a Connects2 CTHUE-VW1 which has all the necessary connections on it to go for a plug & play swap, apart from the illumination/dimming of the head unit. The adapter has an orange cable that has to be connected to the illumination feed from the head lights switch apparently. I have the auto lights switch on my car.

Can anyone advise on which cable I need to splice into, to get the illumination to dim down correctly when the headlights are on please? I've read many articles and there seems to be some conflicting opinions on whether to use a red/orange cable, or a solid grey cable -- I can't for the life of me find a wiring diagram for the switch so I'm kinda stuck!

Any help would be much appreciated.

Thank you all in advance.